First Law of Thermodynamics Definition

Chemistry Glossary Definition of First Law of Thermodynamics

First Law of Thermodynamics Definition: The law which states that the total energy of a system and its surroundings remain constant.

Alternate Definition: The change in the energy of a system equals the heat flow in the system from the surroundings minus the work done by the system on the surroundings. Also known as the Law of Conservation of Energy.